Spin-wave gap collapse in Rh-doped Sr 2 IrO 4

Bertinshaw, J.; Kim, J. K.; Porras, J.; Ueda, K.; Sung, N. H.; Efimenko, A.; Bombardi, A.; Kim, Jungho; Keimer, B.; Kim, B. J.

doi:10.1103/PhysRevB.101.094428

Title: Spin-wave gap collapse in Rh-doped ${Sr}_{2} {IrO}_{4}$

Journal Article · Mon Mar 23 00:00:00 EDT 2020 · Physical Review. B

DOI:https://doi.org/10.1103/PhysRevB.101.094428· OSTI ID:1605964

Bertinshaw, J.;

; Porras, J.;

; Sung, N. H.; Efimenko, A.;

;

; Keimer, B.; Kim, B. J.

We use resonant inelastic x-ray scattering (RIXS) at the Ir L₃ edge to study the effect of hole doping upon the J_eff = $\frac{1}{2}$ Mott-insulating state in Sr₂IrO₄, via Rh replacement of the Ir site. The spin-wave gap, associated with XY-type spin-exchange anisotropy, collapses with increasing Rh content, prior to the suppression of the Mott-insulating state and in contrast to electron doping via La substitution of the Sr site. At the same time, despite heavy damping, the d-d excitation spectra retain their overall amplitude and dispersion character. A careful study of the spin-wave spectrum reveals that deviations from the J₁-J₂-J₃ Heisenberg used to model the pristine system disappear at intermediate doping levels. These findings are interpreted in terms of a modulation of Ir-Ir correlations due to the influence of Rh impurities upon nearby Ir wave functions, even as the single-band J_eff = $\frac{1}{2}$ model remains valid up to full carrier delocalization. They underline the importance of the transition metal site symmetry when doping pseudospin systems such as Sr₂IrO₄.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: European Research Council (ERC); Institute for Basic Science; Alexander von Humboldt Foundation; National Research Foundation of Korea (NRF); USDOE Office of Science (SC)

Grant/Contract Number:: AC02-06CH11357; 669550; 2018H1A2A1059958

OSTI ID:: 1605964

Alternate ID(s):: OSTI ID: 1607867

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Vol. 101 Journal Issue: 9; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 6 works

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Title: Spin-wave gap collapse in Rh-doped ${Sr}_{2} {IrO}_{4}$